Information disclosure in firefox-esr (Alpine package)

1) Information disclosure

EUVDB-ID: #VU50021

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-23953

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to cross-origin information leak when processing PDF files. A remote attacker can create a specially crafted PDF file, trick the victim into opening it and gain access to sensitive information via redirected PDF requests, when said information is served as chunked data.

Mitigation

Install update from vendor's website.

Vulnerable software versions

firefox-esr (Alpine package): 60.4.0-r0 - 78.6.1-r0

CPE2.3

• cpe:2.3:o:alpine:firefox-esr_alpine_package:78.6.1-r0:*:*:*:*:alpine_linux:*:
• cpe:2.3:o:alpine:firefox-esr_alpine_package:78.1.0-r1:*:*:*:*:alpine_linux:*:
• cpe:2.3:o:alpine:firefox-esr_alpine_package:78.0.2-r0:*:*:*:*:alpine_linux:*:

External links

http://git.alpinelinux.org/aports/commit/?id=3bfe2035546b511130bb1e0f6aee1a9de86814d9

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.